"""This file and its contents are licensed under the Apache License 2.0. Please see the included NOTICE for copyright information and LICENSE for a copy of the license.
"""
import uuid

from django import forms
from django.conf import settings
from django.shortcuts import redirect
from django.contrib import auth
from django.urls import reverse
from django.core.files.images import get_image_dimensions

from organizations.models import Organization
from core.utils.common import load_func


def hash_upload(instance, filename):
    filename = str(uuid.uuid4())[0:8] + '-' + filename
    return settings.AVATAR_PATH + '/' + filename


def check_avatar(files):
    images = list(files.items())
    if not images:
        return None

    filename, avatar = list(files.items())[0]  # get first file
    w, h = get_image_dimensions(avatar)
    if not w or not h:
        raise forms.ValidationError("Can't read image, try another one")

    # validate dimensions
    max_width = max_height = 1200
    if w > max_width or h > max_height:
        raise forms.ValidationError('Please use an image that is %s x %s pixels or smaller.'
                                    % (max_width, max_height))

    # validate content type
    main, sub = avatar.content_type.split('/')
    if not (main == 'image' and sub.lower() in ['jpeg', 'jpg', 'gif', 'png']):
        raise forms.ValidationError(u'Please use a JPEG, GIF or PNG image.')

    # validate file size
    max_size = 1024 * 1024
    if len(avatar) > max_size:
        raise forms.ValidationError('Avatar file size may not exceed ' + str(max_size/1024) + ' kb')

    return avatar


def save_user(request, next_page, user_form):
    """ Save user instance to DB
    """
    user = user_form.save()
    user.username = user.email.split('@')[0]
    user.save()

    if Organization.objects.exists():
        org = Organization.objects.first()
        org.add_user(user)
    else:
        org = Organization.create_organization(created_by=user, title='Label Studio')
    user.active_organization = org
    user.save(update_fields=['active_organization'])

    redirect_url = next_page if next_page else reverse('projects:project-index')
    auth.login(request, user, backend='django.contrib.auth.backends.ModelBackend')
    return redirect(redirect_url)


def proceed_registration(request, user_form, organization_form, next_page):
    """ Register a new user for POST user_signup
    """
    # save user to db
    save_user = load_func(settings.SAVE_USER)
    response = save_user(request, next_page, user_form)

    return response
